app/src/main/java/net/ktnx/mobileledger/async/RetrieveTransactionsTask.java

   1 /*
   2  * Copyright © 2019 Damyan Ivanov.
   3  * This file is part of Mobile-Ledger.
   4  * Mobile-Ledger is free software: you can distribute it and/or modify it
   5  * under the term of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your opinion), any later version.
   8  *
   9  * Mobile-Ledger is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License terms for details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with Mobile-Ledger. If not, see <https://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.ktnx.mobileledger.async;
  19
  20 import android.annotation.SuppressLint;
  21 import android.database.sqlite.SQLiteDatabase;
  22 import android.os.AsyncTask;
  23 import android.os.OperationCanceledException;
  24 import android.util.Log;
  25
  26 import net.ktnx.mobileledger.R;
  27 import net.ktnx.mobileledger.model.Data;
  28 import net.ktnx.mobileledger.model.LedgerAccount;
  29 import net.ktnx.mobileledger.model.LedgerTransaction;
  30 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  31 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  32 import net.ktnx.mobileledger.ui.activity.MainActivity;
  33 import net.ktnx.mobileledger.utils.MLDB;
  34 import net.ktnx.mobileledger.utils.NetworkUtil;
  35
  36 import java.io.BufferedReader;
  37 import java.io.FileNotFoundException;
  38 import java.io.IOException;
  39 import java.io.InputStream;
  40 import java.io.InputStreamReader;
  41 import java.lang.ref.WeakReference;
  42 import java.net.HttpURLConnection;
  43 import java.net.MalformedURLException;
  44 import java.net.URLDecoder;
  45 import java.util.ArrayList;
  46 import java.util.Date;
  47 import java.util.regex.Matcher;
  48 import java.util.regex.Pattern;
  49
  50
  51 public class RetrieveTransactionsTask
  52         extends AsyncTask<Void, RetrieveTransactionsTask.Progress, Void> {
  53     public static final int MATCHING_TRANSACTIONS_LIMIT = 50;
  54     private static final Pattern transactionStartPattern = Pattern.compile("<tr class=\"title\" " +
  55                                                                            "id=\"transaction-(\\d+)\"><td class=\"date\"[^\"]*>([\\d.-]+)</td>");
  56     private static final Pattern transactionDescriptionPattern =
  57             Pattern.compile("<tr class=\"posting\" title=\"(\\S+)\\s(.+)");
  58     private static final Pattern transactionDetailsPattern =
  59             Pattern.compile("^\\s+" + "(\\S[\\S\\s]+\\S)\\s\\s+([-+]?\\d[\\d,.]*)(?:\\s+(\\S+)$)?");
  60     private static final Pattern endPattern = Pattern.compile("\\bid=\"addmodal\"");
  61     protected WeakReference<MainActivity> contextRef;
  62     protected int error;
  63     Pattern account_name_re = Pattern.compile("/register\\?q=inacct%3A([a-zA-Z0-9%]+)\"");
  64     Pattern account_value_re = Pattern.compile(
  65             "<span class=\"[^\"]*\\bamount\\b[^\"]*\">\\s*([-+]?[\\d.,]+)(?:\\s+(\\S+))?</span>");
  66     Pattern tr_end_re = Pattern.compile("</tr>");
  67     Pattern descriptions_line_re = Pattern.compile("\\bdescriptionsSuggester\\s*=\\s*new\\b");
  68     Pattern description_items_re = Pattern.compile("\"value\":\"([^\"]+)\"");
  69     // %3A is '='
  70     private boolean success;
  71     public RetrieveTransactionsTask(WeakReference<MainActivity> contextRef) {
  72         this.contextRef = contextRef;
  73     }
  74     private static final void L(String msg) {
  75         Log.d("transaction-parser", msg);
  76     }
  77     @Override
  78     protected void onProgressUpdate(Progress... values) {
  79         super.onProgressUpdate(values);
  80         MainActivity context = getContext();
  81         if (context == null) return;
  82         context.onRetrieveProgress(values[0]);
  83     }
  84     @Override
  85     protected void onPreExecute() {
  86         super.onPreExecute();
  87         MainActivity context = getContext();
  88         if (context == null) return;
  89         context.onRetrieveStart();
  90     }
  91     @Override
  92     protected void onPostExecute(Void aVoid) {
  93         super.onPostExecute(aVoid);
  94         MainActivity context = getContext();
  95         if (context == null) return;
  96         context.onRetrieveDone(success);
  97     }
  98     @Override
  99     protected void onCancelled() {
 100         super.onCancelled();
 101         MainActivity context = getContext();
 102         if (context == null) return;
 103         context.onRetrieveDone(false);
 104     }
 105     @SuppressLint("DefaultLocale")
 106     @Override
 107     protected Void doInBackground(Void... params) {
 108         MobileLedgerProfile profile = Data.profile.get();
 109         Progress progress = new Progress();
 110         int maxTransactionId = Progress.INDETERMINATE;
 111         success = false;
 112         ArrayList<LedgerAccount> accountList = new ArrayList<>();
 113         ArrayList<LedgerTransaction> transactionList = new ArrayList<>();
 114         LedgerAccount lastAccount = null;
 115         Data.backgroundTaskCount.incrementAndGet();
 116         try {
 117             HttpURLConnection http = NetworkUtil.prepare_connection("journal");
 118             http.setAllowUserInteraction(false);
 119             publishProgress(progress);
 120             MainActivity ctx = getContext();
 121             if (ctx == null) return null;
 122             try (SQLiteDatabase db = MLDB.getWritableDatabase()) {
 123                 try (InputStream resp = http.getInputStream()) {
 124                     if (http.getResponseCode() != 200) throw new IOException(
 125                             String.format("HTTP error %d", http.getResponseCode()));
 126                     db.beginTransaction();
 127                     try {
 128                         String ledgerTitle = null;
 129
 130                         db.execSQL("UPDATE transactions set keep=0");
 131                         db.execSQL("update account_values set keep=0;");
 132                         db.execSQL("update accounts set keep=0;");
 133
 134                         ParserState state = ParserState.EXPECTING_ACCOUNT;
 135                         String line;
 136                         BufferedReader buf =
 137                                 new BufferedReader(new InputStreamReader(resp, "UTF-8"));
 138
 139                         int processedTransactionCount = 0;
 140                         int transactionId = 0;
 141                         int matchedTransactionsCount = 0;
 142                         LedgerTransaction transaction = null;
 143                         LINES:
 144                         while ((line = buf.readLine()) != null) {
 145                             throwIfCancelled();
 146                             Matcher m;
 147                             //L(String.format("State is %d", updating));
 148                             switch (state) {
 149                                 case EXPECTING_ACCOUNT:
 150                                     if (line.equals("<h2>General Journal</h2>")) {
 151                                         state = ParserState.EXPECTING_TRANSACTION;
 152                                         L("→ expecting transaction");
 153                                         Data.accounts.set(accountList);
 154                                         continue;
 155                                     }
 156                                     m = account_name_re.matcher(line);
 157                                     if (m.find()) {
 158                                         String acct_encoded = m.group(1);
 159                                         String acct_name = URLDecoder.decode(acct_encoded, "UTF-8");
 160                                         acct_name = acct_name.replace("\"", "");
 161                                         L(String.format("found account: %s", acct_name));
 162
 163                                         profile.storeAccount(acct_name);
 164                                         lastAccount = new LedgerAccount(acct_name);
 165                                         accountList.add(lastAccount);
 166
 167                                         state = ParserState.EXPECTING_ACCOUNT_AMOUNT;
 168                                         L("→ expecting account amount");
 169                                     }
 170                                     break;
 171
 172                                 case EXPECTING_ACCOUNT_AMOUNT:
 173                                     m = account_value_re.matcher(line);
 174                                     boolean match_found = false;
 175                                     while (m.find()) {
 176                                         throwIfCancelled();
 177
 178                                         match_found = true;
 179                                         String value = m.group(1);
 180                                         String currency = m.group(2);
 181                                         if (currency == null) currency = "";
 182                                         value = value.replace(',', '.');
 183                                         L("curr=" + currency + ", value=" + value);
 184                                         profile.storeAccountValue(lastAccount.getName(), currency,
 185                                                 Float.valueOf(value));
 186                                         lastAccount.addAmount(Float.parseFloat(value), currency);
 187                                     }
 188
 189                                     if (match_found) {
 190                                         state = ParserState.EXPECTING_ACCOUNT;
 191                                         L("→ expecting account");
 192                                     }
 193
 194                                     break;
 195
 196                                 case EXPECTING_TRANSACTION:
 197                                     if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 198                                     m = transactionStartPattern.matcher(line);
 199                                     if (m.find()) {
 200                                         transactionId = Integer.valueOf(m.group(1));
 201                                         state = ParserState.EXPECTING_TRANSACTION_DESCRIPTION;
 202                                         L(String.format(
 203                                                 "found transaction %d → expecting description",
 204                                                 transactionId));
 205                                         progress.setProgress(++processedTransactionCount);
 206                                         if (maxTransactionId < transactionId)
 207                                             maxTransactionId = transactionId;
 208                                         if ((progress.getTotal() == Progress.INDETERMINATE) ||
 209                                             (progress.getTotal() < transactionId))
 210                                             progress.setTotal(transactionId);
 211                                         publishProgress(progress);
 212                                     }
 213                                     m = endPattern.matcher(line);
 214                                     if (m.find()) {
 215                                         L("--- transaction value complete ---");
 216                                         success = true;
 217                                         break LINES;
 218                                     }
 219                                     break;
 220
 221                                 case EXPECTING_TRANSACTION_DESCRIPTION:
 222                                     if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 223                                     m = transactionDescriptionPattern.matcher(line);
 224                                     if (m.find()) {
 225                                         if (transactionId == 0)
 226                                             throw new TransactionParserException(
 227                                                     "Transaction Id is 0 while expecting " +
 228                                                     "description");
 229
 230                                         transaction =
 231                                                 new LedgerTransaction(transactionId, m.group(1),
 232                                                         m.group(2));
 233                                         state = ParserState.EXPECTING_TRANSACTION_DETAILS;
 234                                         L(String.format("transaction %d created for %s (%s) →" +
 235                                                         " expecting details", transactionId,
 236                                                 m.group(1), m.group(2)));
 237                                     }
 238                                     break;
 239
 240                                 case EXPECTING_TRANSACTION_DETAILS:
 241                                     if (line.isEmpty()) {
 242                                         // transaction data collected
 243                                         if (transaction.existsInDb(db)) {
 244                                             db.execSQL("UPDATE transactions SET keep = 1 WHERE " +
 245                                                        "profile = ? and id=?",
 246                                                     new Object[]{profile.getUuid(),
 247                                                                  transaction.getId()
 248                                                     });
 249                                             matchedTransactionsCount++;
 250
 251                                             if (matchedTransactionsCount ==
 252                                                 MATCHING_TRANSACTIONS_LIMIT)
 253                                             {
 254                                                 db.execSQL("UPDATE transactions SET keep=1 WHERE " +
 255                                                            "profile = ? and id < ?",
 256                                                         new Object[]{profile.getUuid(),
 257                                                                      transaction.getId()
 258                                                         });
 259                                                 success = true;
 260                                                 progress.setTotal(progress.getProgress());
 261                                                 publishProgress(progress);
 262                                                 break LINES;
 263                                             }
 264                                         }
 265                                         else {
 266                                             profile.storeTransaction(transaction);
 267                                             matchedTransactionsCount = 0;
 268                                             progress.setTotal(maxTransactionId);
 269                                         }
 270
 271                                         state = ParserState.EXPECTING_TRANSACTION;
 272                                         L(String.format(
 273                                                 "transaction %s saved → expecting transaction",
 274                                                 transaction.getId()));
 275                                         transaction.finishLoading();
 276                                         transactionList.add(transaction);
 277
 278 // sounds like a good idea, but transaction-1 may not be the first one chronologically
 279 // for example, when you add the initial seeding transaction after entering some others
 280 //                                            if (transactionId == 1) {
 281 //                                                L("This was the initial transaction. Terminating " +
 282 //                                                  "parser");
 283 //                                                break LINES;
 284 //                                            }
 285                                     }
 286                                     else {
 287                                         m = transactionDetailsPattern.matcher(line);
 288                                         if (m.find()) {
 289                                             String acc_name = m.group(1);
 290                                             String amount = m.group(2);
 291                                             String currency = m.group(3);
 292                                             if (currency == null) currency = "";
 293                                             amount = amount.replace(',', '.');
 294                                             transaction.addAccount(
 295                                                     new LedgerTransactionAccount(acc_name,
 296                                                             Float.valueOf(amount), currency));
 297                                             L(String.format("%d: %s = %s", transaction.getId(),
 298                                                     acc_name, amount));
 299                                         }
 300                                         else throw new IllegalStateException(
 301                                                 String.format("Can't parse transaction %d details",
 302                                                         transactionId));
 303                                     }
 304                                     break;
 305                                 default:
 306                                     throw new RuntimeException(
 307                                             String.format("Unknown parser updating %s",
 308                                                     state.name()));
 309                             }
 310                         }
 311
 312                         throwIfCancelled();
 313
 314                         db.execSQL("DELETE FROM transactions WHERE profile=? AND keep = 0",
 315                                 new String[]{profile.getUuid()});
 316                         db.setTransactionSuccessful();
 317
 318                         Log.d("db", "Updating transaction value stamp");
 319                         Date now = new Date();
 320                         profile.set_option_value(MLDB.OPT_LAST_SCRAPE, now.getTime());
 321                         Data.lastUpdateDate.set(now);
 322                         Data.transactions.set(transactionList);
 323                     }
 324                     finally {
 325                         db.endTransaction();
 326                     }
 327                 }
 328             }
 329         }
 330         catch (MalformedURLException e) {
 331             error = R.string.err_bad_backend_url;
 332             e.printStackTrace();
 333         }
 334         catch (FileNotFoundException e) {
 335             error = R.string.err_bad_auth;
 336             e.printStackTrace();
 337         }
 338         catch (IOException e) {
 339             error = R.string.err_net_io_error;
 340             e.printStackTrace();
 341         }
 342         catch (OperationCanceledException e) {
 343             error = R.string.err_cancelled;
 344             e.printStackTrace();
 345         }
 346         finally {
 347             Data.backgroundTaskCount.decrementAndGet();
 348         }
 349         return null;
 350     }
 351     private MainActivity getContext() {
 352         return contextRef.get();
 353     }
 354     private void throwIfCancelled() {
 355         if (isCancelled()) throw new OperationCanceledException(null);
 356     }
 357
 358     private enum ParserState {
 359         EXPECTING_ACCOUNT, EXPECTING_ACCOUNT_AMOUNT, EXPECTING_JOURNAL, EXPECTING_TRANSACTION,
 360         EXPECTING_TRANSACTION_DESCRIPTION, EXPECTING_TRANSACTION_DETAILS
 361     }
 362
 363     public class Progress {
 364         public static final int INDETERMINATE = -1;
 365         private int progress;
 366         private int total;
 367         Progress() {
 368             this(INDETERMINATE, INDETERMINATE);
 369         }
 370         Progress(int progress, int total) {
 371             this.progress = progress;
 372             this.total = total;
 373         }
 374         public int getProgress() {
 375             return progress;
 376         }
 377         protected void setProgress(int progress) {
 378             this.progress = progress;
 379         }
 380         public int getTotal() {
 381             return total;
 382         }
 383         protected void setTotal(int total) {
 384             this.total = total;
 385         }
 386     }
 387
 388     private class TransactionParserException extends IllegalStateException {
 389         TransactionParserException(String message) {
 390             super(message);
 391         }
 392     }
 393 }